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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var day = 3;
        switch(day){
            case 0:
                console.log("今天是星期一");
                break;    
            case 1:
                console.log("今天是星期二");
                break;    
            case 2:
                console.log("今天是星期三");
                break;    
            case 3:
                console.log("今天是星期四");
                break;    
            case 4:
                console.log("今天是星期五");
                break;    
            case 5:
                console.log("今天是星期六");
                break;    
            case 6:
                console.log("今天是星期日");
                break;
            default:
                console.log("今天星期八");
                    
        }
    </script>
</body>
</html>